Public bug reported:
Binary package hint: xserver-xorg
The configure script from xserver-xorg detects video hardware using
/sbin/discover.
discover returns video devices using the same order that lspci does.
(bus order?)
This makes the integrated video to appear BEFORE the one inserted on a
AGP/PCI-E slot. Why is this wrong?
- When you configure BIOS setup to use the agp/pci-e device as the
primary one, you will see the POST/grub/usplash in one monitor and X in
the other one (as multihead is not configured)
- There are some broken BIOSes which shows the integrated device in
lspci/discover even when you disable it in BIOS setup. This will make X
fail (for instance, in live cd)
X knows what's the primary video adapter. From /var/log/Xorg.0.log, I found the
line
"(II) Primary Device is: PCI 01:00:0"
The problem lies here:
/var/lib/dpkg/info/xserver-xorg.config line 576 (dapper's xorg):
# collect information about installed video card(s), if possible
if which discover > /dev/null 2>&1; then
DISCOVERED_VIDEO=$(xdiscover_video)
MULTIHEAD=$(echo "$DISCOVERED_VIDEO" | wc -l)
DISCOVERED_VIDEO=$(echo "$DISCOVERED_VIDEO" | head -n 1)
if [ -n "$DISCOVERED_VIDEO" ]; then
NCARDS=$(echo "$DISCOVERED_VIDEO" | wc -l)
SERVERS=$(echo "$DISCOVERED_VIDEO" | awk 'BEGIN { FS="\t" } {print $2}' |
grep -v unknown | sort | uniq)
if [ -n "$SERVERS" ]; then
NSERVERS=$(echo "$SERVERS" | wc -l)
fi
DRIVERS=$(echo "$DISCOVERED_VIDEO" | awk 'BEGIN { FS="\t" } {print $NF}' |
grep -v unknown | sort | uniq)
if [ -n "$DRIVERS" ]; then
NDRIVERS=$(echo "$DRIVERS" | wc -l)
fi
if [ $MULTIHEAD -gt 1 ]; then
MULTIHEAD=yes
fi
fi
fi
This code just configures video adapters in the same order discover
gives them. It would be desirable that it could find which one is the
primary video, as X already knows how to do.
** Affects: xorg (Ubuntu)
Importance: Untriaged
Status: Confirmed
--
wrong primary display selected in multihead setup (PCI bus enumeration order)
https://launchpad.net/bugs/55928
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
